Type-bed for printing-machines



(No' Model.)

J. T. HAWKINS.

TYPE BED FOR PRINTING MAGHINES.

Pabented Oct. 27

N PETERS. PholwLilhcguphu. Washington. as

UNITED STATES PATENT OFFICE.

JOHN T. HAWKINS, OF TAUNTON, MASSACHUSETTS.

TYPE-BED FOR PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 328,940, dated October 27, 1885.

Application filed May 6, IP85. Serial No. 164,555. (No model.)

To all whom it may concern:

Be it known that I, JOHN T. HAWKINS, of Taunton, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Type-Beds for Print ing-Machines, which invention or impro"ements are fully setforth and illustrated in the following specification and accompanying drawings.

The object of this invention is to absorb and store up the momentum of the reciprocating bed at the end of the stroke, and thus to utilize said momentum in starting the bed upon its return-stroke, and to adjust the height of the central bed-rollers by means hereinafter described.

The invention consists of the parts and combinations of parts, as hereinafter described, and set forth in the claims.

In the accompanying drawings, Figure 1 is a longitudinal vertical section through the cen ter of a cylinder printing-press, showing the parts constituting the invention herein claimed. Fig. 2 is an elevation from the righthand end ofFig. 1, partly in section. Fig. 3 is an elevation of the bracket and shaft which carry the inner bedrollers. Fig. 4 shows the eccentrical shaft used in Fig. 3, upon which the inner bed-rollers revolve.

In said drawings the several parts are respectively indicated by letters, as follows:

A is the main frames; B, the main crossstay or girder, immediately under theimpression-cylinder. O is the impression-cylinder, and D the type-bed. B are brackets carrying two rollers,supporting the type-bed in its central parts. 13 are rollers running on the under side of the bed. B are rollers running on studs in the frames A, upon which the outer edges of the bed run. R is a toothed rack secured to the bed D. R represents toothed gearing secured to the cylinder 0 and engaging the rack R. R is a toothed pinion carried on a shaft, journaled in the frames A, and engaging the gearing R. The shaft R is operated by means of a hand-crank, (not shown,) secured thereto in any suitable manner. Said crank is not continuously rotated or revolved, like the pulley of a power-press, but is reversed and rotated in opposite directions for the opposite reciprocations of the bed.

' E is a platform for the paper, and E the feed-board, hinged at E in the brackets E E are a pair of eccentric cams secured to a shaft, E journaled in the frames A, upon which the free end of the feed-board rests.

E is a shaft journaled in the frames A, to which are secured the sheet guides or gages E.

The cylinder 0 runs loosely upon eccentric journals formed on the rock-shaft O.

- C a're eccentric bushes or boxes, in which the rock-shaft O is journaled, as described in the application filed by me December 26, 1883, hearing the serial number 115,603.

In brackets D, depending from the under side of the type-bed D, slide two spring-rods, D", surrounded by helical springs D, adjusted in tension by the collar D'. One end of each spring-rod D slides in bushes D", which bushes slide in the brackets D, so that one spring D on each rod serves to resist the momentum at both ends of the stroke. The shaft d is journaled in brackets (1, extending from one of the frames A, to which shaft are secured two levers, d and d carrying on their free ends circular enlargements, as shown. Two connecting'rods, d, articulated at one end each to the levers d and at their other ends to the double-ended levers 11", on the other side of the press, also carry on their upper free ends circular enlargements, as shown. To one of the levers d is secured, or forming a part of it, a handle, d so placed as to be convenient to the feeder. Attachedto one of the frames A, at each end, is acylindrical hollow bracket or stop, d sufficiently large in the opening to allow the head of the rod D at one end, or the bush D at the other end, to pass freely through them when the free ends of the levers d or d are not placed over them. When the free ends of the levers d or d are placed over the openings through the stops d", the spring-rod D at one end, and the bush D at the other,come in contact with then1,1naking them,together with the brackets 01, serve as stops to compress the springs D. In this way the press may be run with or without springs by the proper placing of the handle d It will,

however, be seen that the springs D, in absorbing the momentum of the bed at the ends of its stroke, first assist the operator to check said momentum, and then, having stored it up, give it back to assist him in reversing the crank and overcoming the inertia of the bed and starting it upon its return-stroke.

The type-bed slides upon ways A, cast on the frames A, except immediately under the cylinder, where the four rollers B and B receive the force of the impression. The bed is guided laterally and its parallelism preserved by the guide A and by the edge of one of the ways A, a tongue of metal, A being planed upon the underside of the bed to engage the two.

In Figs. 3 and 4 is shown the arrangement of an eccentric shaft,furnishing a simple means for adjusting the rollers B to v the roller-ways on the under side of the bed D, consisting of a bolt, j, having a large and a small end concentrio with each other, and a central portion on which the roller 13 runs, eccentrically placed with reference to both ends, said bolt being held from rotating from any position chosen by the nut j,binding the shoulder nearest the nut against the side of the bracket B. The larger end of bolt projects beyond the bracket 13, and is furnished with pin-wrench holes j, by means of which to adjustably rotate it and hold it in position while securing it with the nut j. As this construction requires the boring of straight holes only of different diameters, concentrically situated in the bracket B, the whole forms a cheap and effective means of vertically adjusting the rollers B Having thus fully described my said improvements as of my invention, I claim 1. In a printing-machine, in combination with a reciprocating type-bed-,as D,and buffersprings, as D, vibrating stop-levers, as d (1 for putting in and out of action the said springs atthe will of the operator, opening and closing stops attached to the frames or other solid part of the machine, as d, and a hand-lever, as d,the whole connected by connecting-rods, as d*, and a shaft, as d, substantially as and for the purposes set forth.

2. In a printingpress, means for the vertical adjustment of the type-bed supporting rollers, consisting of a shaft upon which the said rollers run, as j, having three different diameters, the largest diameter at one'end and the smallest at the other, concentric with each other, and the center diameter eccentrically placed with reference to the other two, whereby said shaft is adapted to be held in any required position, substantially as and for the purposes set forth.

JOHN T. HAWKINS.

Witnesses:

WM. 0. FINDLAY, FRANoIs P. REILLY. 

